)is it always the case that [ a, b bb2 ] = 2bb [ a, b bb ] ? (1) if not always, what is a necessary condition for (1) to be correct? is it a necessary or sufficient condition that the commutator [ a, b bb ] reduces to a sheer number? an example of the latter case is the canonical commutation relations between components of the particle position and momentum operators:

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the answer would be c. sediment buildup on continental slope

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